overlordship vs prepotency

overlordship

noun
  • The position or quality of being an overlord. 

  • The realm of overlords. 

prepotency

noun
  • The quality or condition of being prepotent; predominance. 

  • The capacity, on the part of one of the parents, as compared with the other, to transmit more than his or her own share of characteristics to their offspring. 

How often have the words overlordship and prepotency occurred in a corpus of books? (source: Google Ngram Viewer )